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Add contract

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This commit is contained in:
Him188 2019-11-16 18:47:17 +08:00
parent a49e97d2e6
commit 9caed32b17
1 changed files with 6 additions and 0 deletions
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6
mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/Message.kt
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@ -6,6 +6,8 @@ import net.mamoe.mirai.contact.Contact
import net.mamoe.mirai.contact.QQ
import net.mamoe.mirai.network.protocol.tim.packet.action.FriendImagePacket
import net.mamoe.mirai.utils.ExternalImage
import kotlin.contracts.ExperimentalContracts
import kotlin.contracts.contract
import kotlin.js.JsName
import kotlin.jvm.Volatile
import kotlin.reflect.KProperty
@ -257,8 +259,12 @@ fun MessageChain(messages: Iterable<Message>): MessageChain = MessageChainImpl(m
*
* @see Message.singleChain receiver 模式
*/
@UseExperimental(ExperimentalContracts::class)
@Suppress("FunctionName")
fun SingleMessageChain(delegate: Message): MessageChain {
contract {
returns() implies (delegate !is MessageChain)
}
require(delegate !is MessageChain) { "delegate for SingleMessageChain should not be any instance of MessageChain" }
return SingleMessageChainImpl(delegate)
}